Failure is more common with the screw put on the Bellows Seal Valves threaded stem wear, so that the valve can not close.

比较常见的故障是阀杆与螺套上的丝扣磨损，陶瓷阀门使阀门无法关闭。

youdao

Failure is more common with the screw put on the Bellows Seal Valves threaded stem wear, so that the valve can not close.

比较常见的故障是阀杆与螺套上的丝扣磨损，陶瓷阀门使阀门无法关闭。

youdao